Science & Mathematics - 19 December 2007

Hi,
I need to hand in a 1st draft of my physics coursework tomorrow. I've made and tested a couple of circuits measuring the resistance of a thermistor at different temperatures. This is for the real-life situation of a drinks machine. The problem is I don't fully understand the purpose of a thermistor in a drinks machine. If it is to measure temperature why not just use a thermometer?
Any help would be greatly appreciated, apart from anything copied + pasted from wikipedia.

2007-12-19 07:05:04 · 5 answers · asked by Jethro 5 in Engineering

a train is coming from Chicago at 150 mph and slows down 2 miles per hour each minute it leaves at 5:00 am
a train is coming from New York at 150 mph gain 2 mph each minute it leaves at 2:00 pm if these 2 train follow the tracks at what time will they meet?

2007-12-19 07:04:08 · 5 answers · asked by Anonymous in Mathematics

If I was going to buy a chemical where the size was described as 1 mCi; 37 MBq, what does this mean? How much is that in normal weight? Thanks.

2007-12-19 06:59:14 · 2 answers · asked by fruitytuttytutty 4 in Chemistry

2007-12-19 06:56:26 · 2 answers · asked by Brian C 1 in Physics

Where do you live? (Country & City)

2007-12-19 06:55:34 · 18 answers · asked by iuoma 3 in Geography

At the homecoming football game,the senior class makes $1.50 for every program sold. Describe the direct variation for the amount of money the senior class will make from selling football programs.

2007-12-19 06:54:06 · 6 answers · asked by Anonymous in Mathematics

2007-12-19 06:52:26 · 3 answers · asked by malkana d 2 in Mathematics

2007-12-19 06:51:16 · 13 answers · asked by okrife 3 in Astronomy & Space

please help me asap! It would be greatly appreciated!

2007-12-19 06:50:15 · 3 answers · asked by Anonymous in Mathematics

I'm 90,000 miles from a distant 'virtual' planet. Call it a point. Beginning from zero, I continue to accelerate. Passing through that point I record my speed. (the mass of the planet can be anything).

I do this again while increasing my distance from this point to 110,000 miles. I record my speed at exactly 100,000 miles. (10,000 miles short of the point).

Are they the same speeds? Can someone help me to set this problem up so I know what I'm doing in the future? I'm not a great algebra student. Yes, I tried astonomy/space.

2007-12-19 06:45:32 · 4 answers · asked by toolmaker 1 in Physics

Find an equation of a parabola (in general form Ax^2 + Bx + C) with vertical axis, vertex at (2,1), and passing
through (1,3). What what is A + B?

I know that y=a(x+h)^2 + k and (h,k) is the vertex but I dont know how to find A and B and how the general form relates to the standard form (y=a(x+h)^2 + k).

Thanks
Chris

2007-12-19 06:44:03 · 2 answers · asked by alanone88 1 in Mathematics

2007-12-19 06:42:31 · 8 answers · asked by inquisitive thinker 1 in Astronomy & Space

A row of six 1.0 N wooden blocks is being pushed across a tabletop at a constant speed by a toy tractor that exerts a force of 1.3 N on the row. What is the coefficient of kinetic friction between the wooden blocks and the tabletop?

2007-12-19 06:40:56 · 2 answers · asked by Anonymous in Physics

Please SHOW THE WORK!!!

2007-12-19 06:40:44 · 4 answers · asked by Anonymous in Mathematics

A stagehand starts sliding a large piece of stage scenery originally at rest by pulling it horizontally with a force of 176 N. What is the coefficient of static friction between the stage floor and the 490 N piece of scenery?

2007-12-19 06:40:14 · 1 answers · asked by Anonymous in Physics

2007-12-19 06:39:19 · 5 answers · asked by Anonymous in Mathematics

so yeh.., why is that?? I see the sun and the moon in the daytime? xxx

2007-12-19 06:38:11 · 22 answers · asked by Anonymous in Astronomy & Space

A certain recipe calls for 2 cups of milk for every 3 cups of flour. If 2 cups of flour are used, how many cups of milk should be used?

and also,

an ear of corn cost 20 cents last year and 30 cents this year. by what percent has the price increased?

thanks....

2007-12-19 06:37:25 · 4 answers · asked by cat 2 in Mathematics

GP-B website had its update on 6th December with a diagram showing that Einstein geodetic prediction is wrong:

Einstein expectation: -6571 +- 1*
4-gyro result (1 sigma) for 85 days
(12 Dec 04 -- 4 Mar 05) -6632 +- 43

However, GP-B website withdrew the diagram sometime between 7th Dec and 8th Dec and replaced it with one that makes no such claims!

Note that if Einstein is wrong then Big Bang theory is totally wrong too! See http://einstein.stanford.edu

2007-12-19 06:34:07 · 5 answers · asked by SeekingTruth 1 in Astronomy & Space

2007-12-19 06:30:02 · 3 answers · asked by Anonymous in Physics

I need the results. I have e-value = [1,4] I need eigen-vector please?

2007-12-19 06:29:15 · 2 answers · asked by Ess 1 in Engineering

2007-12-19 06:28:47 · 7 answers · asked by STORMY K 3 in Engineering

2007-12-19 06:25:19 · 7 answers · asked by Anonymous in Astronomy & Space

Use any priciples of physics to answer

2007-12-19 06:25:16 · 2 answers · asked by FIZZZ 1 in Physics

measure the distance of moon from Earth. But we don't have this device on the sun, and we still know its distance from Earth. Btw, the Russians also have mirrors on the moon. And there is no russian ever set foot on moon

2007-12-19 06:24:56 · 22 answers · asked by inquisitive thinker 1 in Astronomy & Space

55) Which of the following has a graph that is symmetric to the x-axis?

y = x
y2 = x
y = x3 - x
y = x2 + 3


What is the answer to the question and why? Can you please explain to me how to do these types of problems??

EASY 10 POINTS!!

2007-12-19 06:23:45 · 8 answers · asked by GJ 2 in Mathematics

2007-12-19 06:19:24 · 4 answers · asked by <3*scOrpiO*<3 2 in Astronomy & Space

The arcs will either be all convex inward or all concave inward and the inscribed circle must be exactly touching all three arcs. I can get close using AutoCAD and the "trial and error" method, but it seems that there would be a formula or a drafting procedure that would make it simple, quick and accurate every time. If there are any math geniuses out there, consider this a challenge. I have not been able to solve this for a few days now.

2007-12-19 06:14:15 · 3 answers · asked by Anonymous in Mathematics

Why not just work with everything in degrees? Why are radians so much better in higher level math. I use radians all the time, but I just don't see the big deal.

2007-12-19 06:12:53 · 4 answers · asked by de4th 4 in Mathematics

PQR is parallel to BC and XC is a straight line. QCB [angle c]=62 degrees, XBC[angle B]=15degrees and BPQ[anglep]=110degrees
Calculate:
(i)RQC....[angleq]
(ii)PBX....[angle b]

2007-12-19 06:12:36 · 2 answers · asked by bubble 1 in Mathematics